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DXGKCB_SAVEMEMORYFORHOTUPDATE callback function (d3dkmddi.h)

A kernel-mode display miniport driver can call DXGKCB_SAVEMEMORYFORHOTUPDATE to save adapter memory to support driver hot update.

Syntax

DXGKCB_SAVEMEMORYFORHOTUPDATE DxgkcbSavememoryforhotupdate;

NTSTATUS DxgkcbSavememoryforhotupdate(
  [in] IN_CONST_HANDLE hAdapter,
  [in] IN_CONST_PDXGKARGCB_SAVEMEMORYFORHOTUPDATE pArgs
)
{...}

Parameters

[in] hAdapter

A handle to the DXGK adapter that is passed to DxgkDdiStartDevice.

[in] pArgs

A pointer to the DXGKARGCB_SAVEMEMORYFORHOTUPDATE structure that contains arguments for this callback.

Return value

DXGKCB_SAVEMEMORYFORHOTUPDATE returns STATUS_SUCCESS if the operation succeeds; otherwise it returns an error code from Ntstatus.h.

Remarks

Each call to DXGKCB_SAVEMEMORYFORHOTUPDATE saves a block of physical memory pages, as well as optionally metadata that the driver wants to associate with the memory block. When the pages are restored, the driver will get a separate call for each saved memory block together with metadata.

For convenience, the callback provides 3 options to save physical memory:

  • As an array of contiguous physical memory ranges (pDataMemoryRanges)
  • As an MDL (pDataMdl)
  • As virtual memory buffer (pData)

One (and only one) of the pointers to data (pDataMemoryRanges, pDataMdl or pData) must be not NULL.

DXGKCB_XXX functions are implemented by Dxgkrnl. To use this callback function, set the appropriate members of DXGKARGCB_SAVEMEMORYFORHOTUPDATE and then call DxgkCbSaveMemoryForHotUpdate via the DXGKRNL_INTERFACE.

Requirements

Requirement Value
Minimum supported client Windows 10, version 1903 (WDDM 2.6)
Header d3dkmddi.h
IRQL PASSIVE_LEVEL

See also

DXGKARGCB_SAVEMEMORYFORHOTUPDATE

DXGKRNL_INTERFACE